Throughout our years of tunneling, Bradshaw Construction Corporation has worked on many complicated, sophisticated, and cutting edge projects.
Each of those projects led us to find innovative solutions to unique problems. We invite you to take an in-depth look at projects where you will see the problems we encountered and how we solved them.
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SUMMARY: Bradshaw construction completed a microtunneling installation of lined 60” steel casing with three (3) 6” HDPE airlines installed within the casing. The casing served as a water intake on the Tennessee River in Madison, Alabama. The MTBM was recovered underwater by the use of divers and was a true test in itself. The major challenge on the project was fighting the buoyant forces of the... Complete Project Profile

SUMMARY: Bradshaw installed 136 linear feet of 50.5 inch steel casing to accommodate a 30 inch ductile iron sewer line under East Brambleton Avenue at the intersection with St. Paul Boulevard in downtown Norfolk,VA. Soil conditions consisted of sand under the water table. Microtunneling was required due to the need to keep the busy intersection open, and because the saturated sand would have been... Complete Project Profile

SUMMARY: To increase capacity and replace an aging sewer pipeline through the Arclermittal Steel facility in Coatesville, PA, Pennsylvania American Water needed to construct a new 30" gravity sewer that would not pass down the plant's main thoroughfare. Bradshaw Construction was contracted to build the trenchless portion this new line parallel to Valley Road. The 1,017' long tunnel was constructed in a... Complete Project Profile

SUMMARY: ODEC’s Wildcat Point Generation Facility (WPGF) in Cecil County, MD will use water from the Conowingo Reservoir in Lancaster County, PA. The Wildcat Point Raw Water Supply Project, consisting of a pump house, wet well shaft and pipelines to convey water from the Susquehanna River to WPGF. These pipelines run through an 830', 60" diameter microtunneled Permalok® steel casing, completed in June... Complete Project Profile

SUMMARY: The City of Raleigh, NC Public Utilities Department has constructed a major upgrade to its Crabtree Creek Interceptor system designed to alleviate hydraulic restrictions, accommodate future projected flows, and minimize SSOs by installing 41,000 lf of 54”, 60”, and 72” gravity sewer. A total of 5,000 lf broken into 14 separate drives by slurry microtunneling methods that went underneath... Complete Project Profile

SUMMARY: Bradshaw Construction completed two drives with four shafts (two per drive) at each tunnel location for a new waterline. The Medina River drive (726 linear feet) included a 70 and 105 foot deep shafts, respectively. The second tunnel at Medio Creek (543 linear feet) consisted of 50 and 55 foot shafts, respectively. 73.5 inch steel casing was installed by slurry microtunneling for both drives... Complete Project Profile

SUMMARY: Bradshaw Construction microtunneled a single 370 linear feet drive of 30 inch steel casing under I-664 in Suffolk, VA. The subsurface conditions consisted of loose clayey & silty sands (SC & SM) below the groundwater table. Settlement was less than an 1/8 of an inch. Bradshaw installed a 16 inch restrained joint ductile iron pipe for a water main inside the jacked casing. Since this was a... Complete Project Profile

SUMMARY: Bradshaw was contracted to install twin 36 inch steel casings from a 30 foot deep pump station shaft at the shoreline of Lake Livingston Reservoir to an intake cofferdam in the lake. Each microtunneled casing was 390 foot long and was used to install 24 inch ductile iron carrier pipes. The soil conditions consisted of clay and sandy silt 20 feet below the water table. Due to the non-cohesive... Complete Project Profile

SUMMARY: This microtunnel project was part of the Design/Build Capital Improvements Program for the City of Tampa. For future city growth, Bradshaw microtunneled a 60" x 428' steel casing under the Hillsborough River for a new 36" DIP water main. Two shafts were constructed: a 23' ID x 45' deep launch shaft at Julian B. Lane River Park and a 10' OD x 40' deep drilled receiving shaft at the Straz... Complete Project Profile

SUMMARY: Bradshaw Construction Corporation completed a microtunnel drive crossing under an interstate and state highway in Birmingham, Alabama. The project consisted of 1,174 feet of 59 inch jacked steel casing for a 36 inch ductile iron water main. Ground cover under the highways ranged from 10 to 100 feet while shafts were an average of 22 feet deep. Mining conditions began with a mixed face of... Complete Project Profile

SUMMARY: Bradshaw was selected to install a 43 inch steel casing by microtunnel outside Austin, TX. The microtunnel was launched from a 190 foot deep shaft at the Mansfield Dam on Lake Travis. The 530LF of lined and coated casing was microtunneled into Lake Travis and the MTBM was recovered underwater. Many of the challenges of the project were related to the deep shaft, underwater MTBM recovery and the... Complete Project Profile

SUMMARY: After another subcontractor failed to complete a guided-bore, Bradshaw Construction was contracted for the installation of 280 linear feet of 43 inch steel casing and a 30 inch ductile iron sewer pipe for an interceptor. The casing was jacked behind a microtunnel boring machine through medium dense sands and sticky clay below the water table. Performing the microtunnel out of a shaft that was... Complete Project Profile

SUMMARY: Bradshaw Construction completed 1,133 foot microtunnel of 96 inch steel casing in a single drive for the Metropolitan Sewer District, located just outside of Louisville, KY. The tunnel was a contractor bid alternate design from (6) separate tunnels to (1) cost-effective large, long tunnel. A 42 inch fiberglass sewer and 30 inch PVC force main were installed within the casing and grout... Complete Project Profile

SUMMARY: Bradshaw Construction installed 120 linear feet of 60 inch welded steel casing by microtunnel. We overcame a significant change in ground conditions from the bid documents to mine through a full face of clay underneath the water table crossing below Central Illinois Railroad. In addition, the reception plan was modified due to utility conflicts which the General Contractor encountered during... Complete Project Profile

SUMMARY: Phase 1 of the Crabtree Basin Wastewater improvements project consisted of 21,000 feet of 30" to 72" diameter gravity sewer pipe. Three segments were designed for trenchless construction by microtunneling. These included two road crossings and one crossing under existing 60" RCP pipeline connected to an active pump station. Bradshaw microtunneled all three crossings in rock and mixed face soil... Complete Project Profile

SUMMARY: Bradshaw Construction contracted with Consolidated Edison (CES) to install 24" chilled water lines on an accelerated schedule in downtown Miami, Florida. The project consisted of open-cut, shafts, and installing 36" Permalok steel casing by microtunneling through limestone under city streets and the CSX Railroad. Four seperate tunnels were launched out of twin launch shafts. The launch shafts... Complete Project Profile

SUMMARY: Bradshaw Construction contracted with the Fairfax County Department of Public Works to install a new 18" sanitary sewer line across I-66, abandoning a previously installed line. During shaft installation, unforeseen partially weathered schist was encountered that could only be excavated using a hammer drill. Fairfax County performed additional geotechnical investigation to determine the extent... Complete Project Profile

SUMMARY: Bradshaw Construction installed 524 linear feet of 52.5 inch Permalok steel casing by microtunneling underneath the heavily traveled I-75 highway. We then installed a 36 inch ductile iron carrier pipe within the tunnel as a new water main. Bradshaw assisted the General Contractor with subcontractor supervision at no additional cost, helping to insure quality of the shaft and concrete work... Complete Project Profile

SUMMARY: This project involved jacking 468 feet of 87.5" steel casing under I-95 near Baltimore, MD. The soil conditions included sand, silt, & clay below the water table. Microtunneling was required by the owner due to the ground conditions and due to the sensitivity of I-95 (an 8 lane highway) to any disturbance. The casing was installed on line and grade without incident. Bradshaw also installed... Complete Project Profile

SUMMARY: Bradshaw Construction installed a total of 300 linear feet of 96 inch Permalok steel casing in two separate drives. The first drive was 75 linear feet under US Route 1 and the second was 225 linear feet under both Dixie Highway and Florida East Coast Railroad. A 66 inch prestressed concrete cylinder pipe was installed within the steel casing for both drives. The tunnels were constructed in... Complete Project Profile

SUMMARY: As part of a major construction project at the Ohio State Medical Center, new chilled water distribution pipelines were designed under the very busy and congested campus. The design included twin pipe-jacked casings under the areas where trenching would have been untenable. Microtunneling was specified. Bradshaw installed 4 microtunnels through glacial deposits below the groundwater table. Complete Project Profile

SUMMARY: This project involved the construction of six tunnels, totaling 1,600'. The tunnels passed under Maryland State and Howard County roads on three phases of Howard County's Little Patuxent Parallel Interceptor project. 60" of jacked steel casing was used to install 36 to 42" of fiberglass reinforced carrier pipe for a gravity sewer. Subsurface conditions ranged from alluvial deposits of gravel and... Complete Project Profile

SUMMARY: Bradshaw Construction installed 2,740' of 42" reinforced concrete pipe for a relief sanitary sewer by microtunneling through sand with cobbles and boulders below the groundwater table at an average depth of 20'. The microtunneling was accomplished in four drives, the longest of which was 810'. Six access shafts were constructed using steel ribs and liner plates (16' and 20' in diameter) and... Complete Project Profile

SUMMARY: This project involved the construction of six tunnels, totaling 1,600'. The tunnels passed under Maryland State and Howard County roads on three phases of Howard County's Little Patuxent Parallel Interceptor project. 60" of jacked steel casing was used to install 36 to 42" of fiberglass reinforced carrier pipe for a gravity sewer. Subsurface conditions ranged from alluvial deposits of gravel and... Complete Project Profile

SUMMARY: The Cow Branch Sewer project in Woodbridge, VA, consisted of the installation of approximately 8,000' of new gravity sewer main in the 8" to 36" diameter size range. 944' of 36" sewer main was to be installed via microtunneling under a wetland area that empties into the Potomac River. This project represented the Prince William County Authority's (PWCSA) first microtunneling project. In lieu of... Complete Project Profile

SUMMARY: As part of a new chiller plant and distribution network, the University of Georgia had to install two 20" chilled water pipelines under the busy intersection of Baxter and Lumpkin Streets on campus. The design called for a single 59" steel casing to house both lines. Trenchless construction by microtunneling was specified to reduce impacts to the surface traffic and buried existing utilities and... Complete Project Profile

SUMMARY: Bradshaw jacked a 59" diameter steel casing 311 feet under interstate highway I-77 behind a microtunnel boring machine (MTBM). The subsurface conditions consisted of clay and sand below the groundwater table. In order to mobilize to the jacking shaft, about a mile of forest was cleared and the equipment was dragged in on sleds. A slide rail system was used for the jacking shaft with special... Complete Project Profile

SUMMARY: The Delta Power Plant project in Delta, PA, consisted of a 565 MW power generating facility that recovers heat from gas exhaust leaving gas turbines. The turbines burn either natural gas or low sulfur diesel fuel oil. A microtunnel solution to installing the cooling water intake and return was developed by the owner, contractor, and tunnel subcontractor. 1,515' of 60" steel casing was jacked... Complete Project Profile

SUMMARY: Bradshaw Construction completed two tunnels of 50" steel casing totaling 291' in Dover, DE. The steel casing was installed by microtunneling and used for 24" and 27" PVC sanitary sewer. There were two main challenges for the project. The greatest challenge was retrofitting a jacking shaft meant for auger-boring to suit the needs of slurry microtunneling. To do this, our crew formed and poured... Complete Project Profile

SUMMARY: Bradshaw Construction mined 2 separate microtunnel drives for the Florida Department of Transportation. One drive was 300 linear feet and the other run was 336 linear feet. A 48 inch and a 42 inch ductile iron pipe water main was installed within the 60 inch steel casing, respectively. The tunnels were below the water table and at a depth ranging from 10 to 30 feet deep. The soils consisted of... Complete Project Profile

SUMMARY: This project involved the construction of two tunnels, totaling 450'. The tunnels passed under Maryland State and Howard County roads on three phases of Howard County's Little Patuxent Parallel Interceptor project. 59" of jacked steel casing was used to install 42" fiberglass reinforced carrier pipe for a gravity sewer. Subsurface conditions ranged from alluvial deposits of gravel and cobbles to... Complete Project Profile

SUMMARY: Bradshaw Construction has completed three tunnels by microtunneling, totaling 1,183 linear feet, below highways and the Arlington National Cemetery for Arlington County's Potomac Interceptor. 60-inches of steel casing was installed by microtunnel through soft ground to place 42-inch FRP carrier pipe for a gravity sewer on one tunnel. 48-inch RCP was direct jacked through rock and mixed face... Complete Project Profile

SUMMARY: Bradshaw Construction was installed 229 linear feet of 51" steel casing by microtunneling for the City of St. Petersburg Water Department. A 36 inch water transmission main was installed inside the casing. During mining, Bradshaw managed to maintain line and grade through very loose sand to medium dense fine sand and slightly silty sand, all below the water table. Complete Project Profile

SUMMARY: Bradshaw Construction was contracted by CH2MHill Constructors Inc. to design build 2,028 linear feet for 60 inch steel casing by microtunneling for a 42 inch ductile iron water main. Bradshaw worked along side Garney Company who installed the open cut portion of the project. The ground conditions consisted of soft ground below the water table. Most of the drives were completed under a heavily... Complete Project Profile

SUMMARY: Bradshaw Construction installed 5,200' of 72" reinforced concrete pipe for a sanitary sewer relief interceptor. 4,000' of pipe was installed by microtunneling through sand with cobbles and boulders and glacial till below the groundwater table at an average depth of 30'. The microtunneling was accomplished in six segments, the longest being 1,150' long using three intermediate jacking stations... Complete Project Profile

SUMMARY: This project consisted of a 477 linear feet of microtunnel for the 12th Street Force Main. We assisted in the construction of shafts. 60 inch Permalok steel casing was used for the microtunneling and 42" ductile iron carrier pipe that was installed within the casing and grouted in place. Ground conditions were soft and the tunnel was mined at minimum cover. Complete Project Profile

SUMMARY: Bradshaw Construction was contracted for this signature FDOT project to install the first one-pass microtunneling system using reinforced concrete pipe from 42 inch to 72 inch. The total linear footage for this gravity storm sewer project was approximately 2,600. The cover below the heavily traveled highways was less than one diameter in most instances to create the gravity flow storm system... Complete Project Profile

SUMMARY: Bradshaw Construction was part in a Tampa Design/Build project. This project consisted of 3 separate drives mined by microtunneling. The first drive consisted of 477 linear feet for 60 inch steel casing to accommodate a 48 inch force main. The second was 450 linear feet and the third at a length of 1,290 linear feet for 60 inch steel casing for a 42 inch force main. These drives were for... Complete Project Profile

SUMMARY: The City of Cumming, GA constructed a new raw water intake in Lake Lanier. Bradshaw Construction was contracted to install the 66" steel casing pipe from the on shore pump station shaft to the intake structure at the bottom of the lake. The pump station shaft was constructed by the jet grout method. Bradshaw jacked the casing using a slurry microtunneling machine. The intake pipeline was designed... Complete Project Profile

SUMMARY: Bradshaw Construction Corporation completed four soft ground tunnels under state roads and a CSX railroad by microtunneling as part of a 37,000 linear foot long sewer pipeline project. The tunnels ranged in diameter from 83 to 96 inches and 110 to 220 linear feet in length. The smaller tunnels were direct jack 78-inch Hobas pipe, and the larger railroad tunnels were 2-pass Permalok steel casing... Complete Project Profile

SUMMARY: Bradshaw was contracted to pipe jack and install a 44 inch Hobas pipe that was provided by Blevins Road Boring. Inc. The drives consisted of (2) twin runs to accommodate Progress Energy's underground transmission lines. The first twin run was 128 linear feet and the second was 207 linear feet, for a total of 607 linear feet for the project. The ground conditions consisted of soft ground... Complete Project Profile

SUMMARY: Bradshaw Construction completed 4 drives of 63" Permalok steel casing by microtunneling in Landsdowne, MD. The 4 drives totaled 905 LF and were under CSX and Amtrak railroads, and US-1 and I-895 highways. The microtunnels were completed using a Herrenknecht 1200TC with a Soft Ground cutting head. The tunnels were originally designed to be 72" Hand Mined Liner Plate, but were changed to Permalok... Complete Project Profile

SUMMARY: Bradshaw Construction installed 2,100' of 43" Permalok steel casing for the 18" dedicated fire system. The tunnels were installed by microtunneling through shale beneath active runways, taxiways, and taxi lanes. The microtunneling was completed in four segments, the longest being 585' long under Runway 19L-01R. Bradshaw also installed the 18" DIP in the tunnels once mining was completed. Crews... Complete Project Profile

SUMMARY: The Table Rock Intake project was a technically complex water-intake project, which required pinpoint accuracy. The project involved the installation of a raw water intake tunnel below the Cleveland, SC, dam and its associated reservoir. The project involved a marine retrieval of the MTBM via a miniscule shaft - 8.5' in diameter to be exact. Tunneling under a dam is inherently a highly sensitive... Complete Project Profile

SUMMARY: Bradshaw jacked twin 59" diameter steel casings 320 feet using a microtunnel boring machine (MTBM). The raw water intake alignment went from a new on-shore pump station to a new underwater intake structure in the Susquehanna River. The subsurface conditions consisted of weak to strong schist. The intake structure was under about 20' of water. Several interventions were made into the head of the... Complete Project Profile

SUMMARY: This project was to install a 24" storm sewer pipe for the City of Portland, Maine. Bradshaw used an Akkerman SL-24 microtunnel boring machine to one pass pipe jack 24" Hobas sewer pipe from shafts constructed by the contractor. The challenge on this project turned out to be the ground conditions which included unexpected cobbles and boulders. These conditions stopped the microtunnel boring... Complete Project Profile

SUMMARY: Bradshaw installed 2,400’ of 42” RCP using an Akkerman Slurry Microtunnel Boring Machine (SL-44). There were 5 separate microtunnel drives, 3 of which encountered boulders requiring rescue shafts. Three drives crossed major highways and one drive crossed under the Pine Island Pond. The geologic report for the project stated the tunnel elevation was selected to avoid any boulders in the... Complete Project Profile

SUMMARY: Bradshaw Construction installed 1,800' of 12" vitrified clay pipe to increase sewer capacity in two neighborhoods in Fairfax County, VA. The line was installed by pilot tube microtunneling through clay, silt, and sand. Due to some cobbles that were encountered, and several existing utilities, Bradshaw was required to perform some of the sewer installation by Open-Cut. There was also a previously... Complete Project Profile

SUMMARY: Bradshaw completed 2,500' of tunnel from Franklin Street to Baltimore Street for a 36" gravity sanitary sewer. The 72" tunnel consisted of four segments, the longest of which was 1,200' beneath Amtrak and Norfolk Southern Railroads. Local geology consisted of very hard rock, with UCS tests of up to 37,000 psi, and was further complicated by the presence of periodic veins of highly decomposed... Complete Project Profile

SUMMARY: Bradshaw completed installation of 1,313 linear feet of 144 inch, and 1,014 liner feet of 72 inch rib and board tunnel for 110 inch and 48 inch fiberglass reinforced sewer. An Akkerman BS-120 digger shield and an Akkerman WM-60 TBM were used to excavate the tunnels. The work was in a busy urban area adjacent to the Anacostia River and a CSX Railroad. The tunnel was excavated through clay and... Complete Project Profile

SUMMARY: Bradshaw Construction installed 1,150' of 75' O.D. Rib and Board Tunnel, as well as 48" DIP Carrier pipe to be utilized as an effluent pipeline. Bradshaw Construction worked through severe weather conditions which caused shaft movement and water intrusion. In addition, the work was completed within a residential zone. Bradshaw worked closely with the General Contractor and local residents... Complete Project Profile

SUMMARY: The NCSS project highlights Bradshaw Construction's ability to redesign projects to increase efficiency, decrease costs, and streamline logistics. The NCSS project was initially designed as a pilot tube MTBM job. However, this would have involved the installation of 8 shafts in the middle of Jefferson Davis Highway - a major artery into and out of DC. We redesigned the project as a rib-and-board... Complete Project Profile

SUMMARY: Bradshaw Construction successfully completed a TBM Tunnel using an Akkerman Digger Shield and 114"Ø Rib & Board Supports under Interstate 95 for the Abingdon Waste Water Treatment Plant. With the key goal of minimizing potential settlement of I-95, the tunnel size was reduced from a plan diameter of 144" to 114". However, the size reduction increased the challenge of installing the Ductile Iron... Complete Project Profile

SUMMARY: The Flint River Transmission Main project was constructed using conventional TBM tunneling in the Hapeville neighborhood of south Atlanta, GA beneath Old Dixie Highway and an active Norfolk Southern railroad. The single 1,040' tunnel consisted of three separate curves. The first two were per plan, while the third was a 650' radius curve added during the tunnel excavation process to avoid a... Complete Project Profile

SUMMARY: Bradshaw responded to the City of Richmond, Virginia's emergency flooding caused by Tropical Storm Ernesto by installing 3,400’ of 110” fiberglass pipe in tunnel to permanently by-pass a collapsed combined sewer. Bradshaw used an Akkerman BS-120 digger shield and ribs and boards to construct the tunnel. Bradshaw pipe jacked 1,000’ of 48” RCP in one run and 260’ of 60” RCP in another... Complete Project Profile

SUMMARY: This project involved the utilization of two tunneling methods: hand mine drill & blast, and a TBM capable of mining through hard rock conditions. For the most part the 1,000' TBM run was self-supporting, but some of the weaker zones required rock bolts, roof channels, and even liner-plates for a short reach. Two drill and blast road crossings totaling 400' were completed on this job. Both drill... Complete Project Profile

SUMMARY: The Elizabethtown project highlights Bradshaw's ability to quickly adapt to major problems in an efficient, expedient manner. A special head was fabricated specifically for this project, based upon the unique conditions indicated by the boring logs. However, the head proved ineffective. Our fabrication department modified the head, and anticipated production rates returned to the expected amount... Complete Project Profile

SUMMARY: Bradshaw Construction Corp. was subcontracted to Rockdale Pipeline Inc. (RPI) to tunnel under the Hillsborough river and install an 84-inch diameter water main in the tunnel. Two shafts were constructed on either side of the river by RPI using driven steel sheets. BCC mined the tunnel by jacking a 98-inch diameter steel casing behind a 101-inch diameter earth pressure balance (EPB) tunnel boring... Complete Project Profile

SUMMARY: Bradshaw was subcontracted by Westra Construction to mine a total of (8) tunnels under state roads and open cut (2) drives for the Tampa Bay Water Authority. 101.5 inch and 99 inch rib and board supports were installed to accommodate and install a 72 inch steel water main. The ground conditions consisted of soft ground and was below the water table. Complete Project Profile

SUMMARY: Bradshaw Construction installed 1,665' of 143” O.D. steel rib and board tunnel for a 96” RCP storm sewer using a modified Lovat TBM. The tunnel was part of a 6,630’ storm sewer project to alleviate flooding in the Argentine area of Kansas City, Kansas. Bradshaw also installed a solder pile and wood lagging mining shaft that attached to an existing box culvert storm drain. The primary... Complete Project Profile

SUMMARY: Bradshaw installed 900’ of 132” OD rib and board tunnel in two drives with mining and receiving shafts for each. The tunnels were excavated through silts and sands using a TBM digger shield. The first tunnel was under Route 50 and the second was under Amtrak Railroad’s high speed rails between DC and Baltimore. 84” and 96” OD steel water main was installed in the tunnels... Complete Project Profile

SUMMARY: BTM Joint Venture, led by Bradshaw Construction, constructed 14,847’ of 99” raw water intake tunnel for the Commissioners of Public Works (CPW) of Charleston, SC. This tunnel extended CPW’s water source further up the Cooper River improving the quality and increasing the quantity of water. The entire tunnel was mined with a Lovat tunnel boring machine (TBM) through Cooper Marl... Complete Project Profile

SUMMARY: BTM Joint Venture, led by Bradshaw Construction, constructed the first deep storm sewer tunnel for the City of Charleston to control flooding along Calhoun Street to Marion Square Park. The work consisted of 2,880’ of 120” rib & board TBM tunnel for a 96” ID cast in place storm sewer, two (2) caisson shafts, and two (2) drop stack intakes. The principal challenge on the project was first... Complete Project Profile

SUMMARY: Bradshaw direct jacked 386 linear feet of 54" reinforced concrete pipe via conventional TBM in two (2) drives, as part of the 11th Street Bridge project in Washington, DC. One drive was minded under I-295, while the other was under an SME wall for the new bridge. Ground conditions were primarily soft, wet silt, sand & clay; however, obstacles such as a large layer of river gravel and buried... Complete Project Profile

SUMMARY: The project for the College of William and Mary involved the construction of twin 600' by 60" diameter runs. 48" ID RCP was jacked behind a 60" diameter Akkerman TBM. Ground conditions encountered on the job included clay with some wet sand layers. The tunnels were used for steam and chilled water lines. Complete Project Profile

SUMMARY: Bradshaw Construction installed 147 linear feet of 72 inch reinforced concrete pipe for a storm water system needing improvements. This was accomplished by direct jacking in a single pass under a CSX Transportation Railroad at a depth of 10 feet below the existing grade. Bradshaw worked closely with the CSX Railroad to install dewatering within the right of way, allowing for this type of... Complete Project Profile

SUMMARY: Bradshaw Construction installed twin tunnels of 42" RCP storm sewer 60' each under a railroad in Baltimore, MD. There were several challenges and delays on the project. All of which stemmed from conflicting permits and access issues. When the methodology of using a TBM for pipe-jacking 42" RCP was finally approved by all parties it was under the allowance that all tunneling work would take... Complete Project Profile

SUMMARY: As part of improvements to increase the capacity of the Ragged Mountain Dam in Charlottesville, VA a tunnel was built to convey primary spillway discharges and house the 36 inch diameter raw water intake pipe which will convey water from the reservoir to the existing treatment facilities near the University of Virginia campus. The 10-foot horseshoe shaped tunnel was 482-feet long. It was... Complete Project Profile

SUMMARY: This project involved the utilization of two tunneling methods: hand mine drill & blast, and a TBM capable of mining through hard rock conditions. For the most part the 1,000' TBM run was self-supporting, but some of the weaker zones required rock bolts, roof channels, and even liner-plates for a short reach. Two drill and blast road crossings totaling 400' were completed on this job. Both drill... Complete Project Profile

SUMMARY: Bradshaw constructed a 13’ horseshoe shaped tunnel 20’ under Morehead Street in downtown Charlotte, NC. The 150’ long was tunnel part of a storm drainage improvement project. The tunnel was designed & constructed using the sequential excavation method (SEM), a hand mine technique using reinforced shotcrete for initial tunnel support. Portions of the tunnel were in mixed face conditions... Complete Project Profile

SUMMARY: Bradshaw Construction designed and built two 13' tall by 16.5' wide shotcrete horseshoe-shaped tunnels, totaling 160', for the city of Charlotte, NC. The tunnels were designed as initial/final shotcrete linings, with a sprayed water barrier between shotcrete layers. In addition, the mix design was supplemented with a cementitious admixture to develop internal water resistant properties in the... Complete Project Profile

SUMMARY: Bradshaw Construction Corporation built the first ever NATM tunnel that utilized compressed air in North America. The project involved the connection of two existing 7' diameter combined sewers to a new 12' diameter relief sewer. Connections were made at seven locations, along a 2,300' alignment in downtown Atlanta. The alignment was enveloped by adjacent structures and utilities. The project was... Complete Project Profile

SUMMARY: Bradshaw Construction Corporation drilled and blasted 1000' of rock, and partially weathered rock, in order to install a 12' diameter wastewater pipeline for the City of Atlanta. In order to complete this project in the most expedient manner, a "no blasting" clause in the contract was waived. With the utilization of blasting, we successfully mined through ground conditions that included coming... Complete Project Profile

SUMMARY: Our client had concerns about breaking rock with a hoe ram so close to an existing water main. Instead, Bradshaw installed two tunnels hand mined through rock under the existing water main. The first one went so well that a second tunnel was added after the first one was completed. The rock was removed via drilling and splitting with pneumatic breakers, and then a steel sleeve was installed as... Complete Project Profile

SUMMARY: Bradshaw installed two 36 inch x 36 inch wood box tunnels, 10 linear feet and 19 linear feet long respectively, as part of a project aimed at upgrading the infrastructure at the Applied Physics Laboratory (APL). The woodbox tunnels were installed directly under two existing active corridors. The hand mined wood box technique was selected over auger boring due to the smaller work area, and the... Complete Project Profile

SUMMARY: Bradshaw installed 16 linear feet of a 48 inch woodbox tunnel in rock under Hilton Street. The tunnel accommodated a new sewer line in a residential area of the City of Baltimore. Tunneling was preferred over open cut by both the owner and the general contractor due to the disturbance associated with open cut rock excavation. Complete Project Profile

SUMMARY: Bradshaw Construction was contracted to hand mine a 48 inch by 48 inch wood box tunnel to house a 10 inch polyvinyl chloride pipe and an 18 inch ductile iron pipe. Unanticipated rock was encountered during mining and was removed with pneumatic chisels and hammers. The tunnel was performed due to the close proximity of existing buildings and structures which did not allow for open cut... Complete Project Profile

SUMMARY: Bradshaw installed 12 linear feet of a 60 inch liner plate tunnel in sandy material under a security wall footing at the John Adams Building in downtown Washington, DC. The tunnel allowed for the connection of a new stormwater management structure to an existing manhole, without disruption to surface features or pedestrian traffic. Complete Project Profile

SUMMARY: Bradshaw Construction completed two shafts and a hand mine liner plate tunnel as part of a storm water overflow project in northwest Washington DC. As a result of flooding in the area, DC Water decided to convert a more than 100 year old sand filtration chamber into a storm water overflow basin. Bradshaw was subcontracted to install 28 vertical feet of 25 foot diameter shaft while working from... Complete Project Profile

SUMMARY: As part of a design/build project, Bradshaw Construction constructed two utility tunnels for the extension to the Children's Hospital of Richmond. Excavation for the first tunnel consisted of 132 inch diameter liner plate with 96 inch reinforced concrete pipe as final lining. The ground conditions were lean clays overlaid with gravely sand in the crown. The second tunnel was for 96 inch liner... Complete Project Profile

SUMMARY: Bradshaw constructed a 48 inch by 48 inch (ID) wood box tunnel under the loading dock for the Holy Cross Hospital in Silver Spring. MD. The over all project was to expand the campus to include a new patient tower for 150 new private patient rooms, a four-level parking garage expansion to accommodate an additional 300 parking spaces, and the central utility plant serving the existing campus... Complete Project Profile

SUMMARY: Bradshaw Construction built a 55' long hand mine liner plate tunnel for Florida State University to prevent pedestrian overflow onto Lafayette Street after FSU football games. Bradshaw has a long history of building liner plate tunnels; what made this project unique was the active CSX railroad tracks only 6.5' overhead. Trains traveled over the tunnel many times per day during construction... Complete Project Profile

SUMMARY: Bradshaw hand tunneled 7 feet under a busy CSX Railroad serving Atlanta, GA to install 115 feet of 13 foot diameter tunnel with only 5'-7' of cover between the tunnel and the tracks. The tunnel supports were steel liner plate lined with epoxy paint. It was part of a new park celebrating railroad history and provided a much needed pedestrian underpass. Compensation grouting and real-time... Complete Project Profile

SUMMARY: Bradshaw Construction completed 276' of 48" x 48" hand-mined wood box tunnels for electrical conduit. The main challenges of the project were not known when the project began. The tunnels were supposed to be in soft ground, but partially complete with the first tunnel our crew encountered some hard rock. There was great difficulty in removing the rock for 25' of the tunnel without blasting or... Complete Project Profile

SUMMARY: Bradshaw Construction installed 62' of 156" steel liner plate tunnel by conventional hand mine methods through a railroad embankment for a pedestrian tunnel. Hand mine techniques were utilized to install the liner plate tunnel under an active Norfolk Southern Railroad with only 7' of cover. Mining took six days to complete, working around the clock. After completion of the excavation, a shotcrete... Complete Project Profile

SUMMARY: As part of a new 3,400' by-pass sewer tunnel, Bradshaw also hand tunneled a total of 200’ of 96” liner plate for a 72” fiberglass storm sewer pipe. Each hand tunnel intersected the 144" rib and board tunnel for underground Y connections or was combined in three way manholes at the shafts. Just as for the primary by-pass tunnel, other major challenges were the extremely accelerated... Complete Project Profile

SUMMARY: Bradshaw Construction installed a 10'Ø Hand Mined Liner Plate tunnel under CSX Railroad in Staunton, Virginia. The tunnel was excavated from a portal through Boulder Fill in the embankment of the railroad. Due to the voids in the fill, a cementitious grout curtain was pumped over the tunnel alignment before mining. In order to mitigate the risks settlement and the danger of mining through... Complete Project Profile

SUMMARY: Bradshaw Construction Corporation successfully rehabilitated 75 storm drains at the Dundalk Marine Terminal located in Baltimore, MD. This was the first time that Sekisui's SPR reline technology was used in a non-man-entry fashion in the US - highlighting our commitment to incorporating cutting edge technologies in our work. Sekisui SPR was used to rehabilitate the storm drains that ranged from... Complete Project Profile

SUMMARY: Bradshaw was contracted to rehabilitate a sewer pipe in a residential area by relining. The steel reinforced spiral wound lining was used for 264 linear feet of 66 inch and 1,000 linear feet of 72 inch corrugated metal pipes. This also included grouting in place. The greatest challenge of the project was working in a live storm sewer which required careful attention to the weather as bypass... Complete Project Profile

SUMMARY: Bradshaw Construction was contracted by Baltimore city to perform an emergency repair and rehabilitation of a collapsed brick sewer causing sewage back-up and flooding in a residential area. Bradshaw excavated down and removed the damaged portion along with the top of the sewer. Then, 30" PVC slip-lining pipe was inserted into the sewer and pushed along the existing pipeline. When the entire... Complete Project Profile

SUMMARY: Bradshaw Construction was selected by USF&G Surety to rehab a gravity sewer that was improperly installed by Modern Continental Construction. Approximately 400' of the 36" DIP sewer had randomly floated above the design elevation when grout backfilled in tunnel. Bradshaw excavated access shafts, by-pass pumped the sewer, performed video surveys to determine the extent of floatation or... Complete Project Profile

SUMMARY: Bradshaw Construction Corporation installed a 60 inch liner plate tunnel to accommodate for a reinforced concrete pipe and slip-lined an existing failing 33 inch Hobas sewer pipe as part of an emergency repair for the City of Baltimore. The shaft was constructed out of steel sheeting with dimensions of 18.5 feet wide x 30 feet long x 33 feet deep. Complete Project Profile

SUMMARY: This microtunnel project was part of the Design/Build Capital Improvements Program for the City of Tampa. For future city growth, Bradshaw microtunneled a 60" x 482' steel casing under the Hillsborough River for a new 36" DIP water main. Two shafts were constructed: a 23' ID x 45' deep launch shaft at Julian B. Lane River Park and a 10' OD x 40' deep drilled receiving shaft at the Straz... Complete Project Profile

SUMMARY: As part of a microtunneling project Bradshaw installed two caissons: a 14’ ID x 40' deep jacking shaft and a 10' ID x 60' deep receiving shaft. They were constructed using precast concrete segments and fitted with steel cutting shoes. They were sunk under their own weight, by excavating the soil with a crane & clam bucket. The lower portions were excavated subaqueous and the bottom slabs were... Complete Project Profile

SUMMARY: BTM Joint Venture, led by Bradshaw Construction, managed the construction of two (2) cast-in-place caisson shafts constructed in downtown Charleston, SC. The project was the first phase of flood control instituted by the City. The first caisson was 30’ ID x 150’ deep at Concord St and served as a tunnel mining shaft and future pump station. The second caisson was 16’ ID x 130’ deep in... Complete Project Profile

SUMMARY: Bradshaw constructed six shafts in downtown Baltimore City for 2,553' of 36” gravity sewer installed in rock by TBM (gneiss up to 37,000 psi). In addition to providing tunnel access, the shafts were used to install new sewer manholes and connections to the existing system. The 16' & 24' diameter shafts (depths ranged from 18' to 57') were supported by steel ribs & wood lagging in the soft... Complete Project Profile

SUMMARY: To resolve CSO flooding from a collapsed sewer for the City of Richmond, Bradshaw installed 4 tunnels from various drive and recovery shafts. These included the use of the New Austrian Tunnel Method (NATM – Sprayed reinforce shotcrete), steel sheet piling, steel rib and wood lagging, and trench box shafts. The all varied in depth up to 60’ deep. The NATM shafts were 30' ID. The structures... Complete Project Profile

SUMMARY: As part of a 6,000 foot microtunnel sewer project, Bradshaw installed a 40’ wide x 70' long x 35’ deep elliptical shaft over an existing 42” sewer and manhole. This shaft was large enough to allow a gravity by-pass of the existing 42” sewer so a unique cross-over structure could be constructed to tie this existing sewer into the new microtunneled 48” sewer. The shaft was excavated by... Complete Project Profile

SUMMARY: The City of Atlanta awarded a design-build contract to Western Summit Constructors, Inc. (WSCI) to construct a 100 mgd, 160' deep pump station at the R.M. Clayton WWTP. WSCI hired Bradshaw/Frontier Kemper JV (BFK) to design, excavate and support the shaft for the pump station. Jenny Engineering designed the shaft for BFK. The shaft was 72' in diameter by 150 feet deep after site excavation. The... Complete Project Profile

SUMMARY: Bradshaw constructed a 48 foot ID x 40 feet deep shaft over an existing 96” sanitary sewer. Bradshaw used the New Austrian Tunneling Method (NATM) to install and support the shaft. The ground conditions were silt, sand (micaceous residual) soils with gneiss boulders. A cast in place concrete junction chamber was built in the shaft to tie in the existing sewer with a new 66” PCCP sewer... Complete Project Profile

SUMMARY: The Metro Entrance Facility was a security-driven project designed to eliminate the direct entry to the Pentagon from the Metro tunnel and provide a secure screening facility for Pentagon visitors. As part of the project, a 50' deep elevator was constructed between the existing underground station and connecting to the existing escalator passage for handicap access. Bradshaw was selected to... Complete Project Profile

SUMMARY: Bradshaw constructed an elliptical shaped shaft with the dimensions of 73 feet x 42 feet x 35 feet deep using the New Austrian Tunnel Method (NATM). The ground conditions were silt, sand and gravel. The shaft was used to install 1,700’ of TBM tunnel for an 84 inch steel water main and to construct a triple 84 inch butterfly valve vault. The principal challenge of the project was to install... Complete Project Profile

SUMMARY: ODEC’s Wildcat Point Generation Facility (WPGF) in Cecil County, MD will use water from the Conowingo Reservoir in Lancaster County, PA. The Wildcat Point Raw Water Supply Project, consisting of a pump house, wet well shaft and pipelines to convey water from the Susquehanna River to WPGF. The wet well shaft was constructed by Bradshaw to serve as both tunnel access and as the permanent intake... Complete Project Profile

SUMMARY: Bradshaw installed a 12 foot diameter rib and board shaft for geotechnical exploration and observation as part of the Maryland Transportation Authority's Purple Line project. The shaft was installed to a depth of 33 feet in sand, silt & decomposed rock, and then backfilled with flowable fill after a four day observation period. Bradshaw's work was completed in 20 working days (including... Complete Project Profile

SUMMARY: Bradshaw Construction completed two shafts and a hand mine liner plate tunnel as part of a storm water overflow project in northwest Washington DC. As a result of flooding in the area, DC Water decided to convert a more than 100 year old sand filtration chamber into a storm water overflow basin. Bradshaw was subcontracted to install 28 vertical feet of 25 foot diameter shaft while working from... Complete Project Profile

SUMMARY: Phase 1 of the Crabtree Basin Wastewater improvements project consisted of 21,000 feet of 30" to 72" diameter gravity sewer pipe. Three segments were designed for trenchless construction by microtunneling. These included two road crossings and one crossing under existing 60" RCP pipeline connected to an active pump station. Bradshaw microtunneled all three crossings in rock and mixed face soil... Complete Project Profile

SUMMARY: As part of a 1,600 linear feet microtunnel sewer project, Bradshaw installed all the 5 drive shafts. Subsurface conditions included silt, clay, and sand with the tunnels well below the ground water table. Bradshaw used interlocking steel sheeting to install the water tight shafts ranging in depth from 18 to 23 feet. The primary challenges of this project were the limited access along lengthy... Complete Project Profile

SUMMARY: Bradshaw Construction installed 2,740 linear feet of 42 inch reinforced concrete pipe for a relief sanitary sewer by microtunneling through sand with cobbles and boulders below the groundwater table at an average depth of 20 feet. The microtunneling was accomplished in four drives, the longest of which was 810 feet. Six access shafts were constructed using steel ribs and liner plates (16 feet... Complete Project Profile

SUMMARY: Bradshaw Construction installed 5,200' of 72" reinforced concrete pipe for a sanitary sewer relief interceptor. 4,000' of pipe was installed by microtunneling through sand with cobbles and boulders and glacial till below the groundwater table at an average depth of 30'. The microtunneling was accomplished in six segments, the longest being 1,150' long using three intermediate jacking stations... Complete Project Profile

SUMMARY: The primary jacking pit on the NCSS project was a 30' deep, 26' diameter shaft supported by steel ribs and wood lagging. The shaft was installed in primarily sandy, dry conditions with interspersed layers of hard clay. One of the main challenges involved in the shaft installation was the presence of a manhole intersecting the shaft. The manhole remained from a previous drilled shaft... Complete Project Profile